Part structure for projection welding a nonmetallic body to a metal part

ABSTRACT

A part structure for projection resistance welding a nonmetallic or electrically non-conductivebody, such as of synthetic resin, wood, porcelain, ceramic, etc. to a metal base wherein the part structure comprises the nonconductive body, a conductive welding projection of the body, and a current conducting member carried by the body leading to the projection from a remote surface on the body; the part structure being weldable on a metal base by including the metal base and a welding machine electrode, such as press-platen, in a welding circuit and disposing the part structure between the metal base and the platen with welding current communicating from the platen to the base through the current conducting member and the projection to fuse the projection with the base.



1. A resistance welding part structure comprising, an electrically nonconductive body having an adjacent surface for fixedly abutting a base and a remote surface for removably abutting a welding machine part such as a press-platen, a current-conducting welding projection on said body extending from said adjacent surface for welding contact with a base, and a current-conducting member carried by said body leading from said remote surface to said projection on said adjacent surface; said structure when positioned between a metal base and a pressplaten, which are connected in a welding circuit, being weldable on the base by transferring current between the pressplaten and the base to said projection at the base via said conducting member to conduct current past said nonconductive body to said projection and to fuse said projection to the base in conjunction with the welding cycle of the welding circuit and the advancing movement of the press-platen, said currentconducting member being an electrically conductive coating layer on said body.
 2. In a device as set forth in claim 1, a bead on said adjacent surface of said body at least partially around said projection; said bead acting as a containing wall for material melting from the heat of welding.
 3. In a device as set forth in claim 1, a ring-bead at least partially around said projection of at least a surface layer of electrical conducting material constituting a welding stud for welding against the metal base. 